Antenna



FIG. 1 is a top front perspective view of an antenna showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrating portions of the antenna are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 